kiron macro 105mm 2.8

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first impression as i never had a macro lens before :
- the dof is very very shallow with the 2.8-5.6 aperture.

- the MF ring is the same as the magnification one ?
it means either i focus by moving the camera closer or farther or by changing the magnification ?

Three points spring to mind,
Was the camera on a tripod.
Were you using a cable release.
Both these will reduce any camera shake
Try and get the object in the same plane as the sensor to make the most of the limited depth of field, or at least at an angle to the sensor where from experience gained by use of the lens you know that it will be all in focus

I handhold for certain insects, butterflies in particular, they tend to be flighty, moths released from a moth trap can often be persuaded to pose in one place once they feel comfortable. My lenses of chioce on mft is a 55mm micro Nikkor f2.8 which is going to be more manageable than your 105mm,which is perhaps a little extreme, certainly requires more care in use. Keep practicing and gaining experience, your shot would certainly be acceptable as a record shot of a rarity for example.
Barrie

Optically this is one of the finest macro lenses ever made. The bokeh is fabulous and you can actually use it at smaller apertures than f16. However, it's really probably too big for an EP1. Definitely use a tripod or monopod.